Core-bar.



No. 874.769. PATENTEDDEG. 24, 1907.

' O. S. HUMPHREY.

GORE BAR.

APPLICATION FILED JULY 11', 1907.

3141mm z ms NORRIS Pzrsas cm, wAsnmaroN, u. c.

PATENT OFFICE.

CHARLES S. HUMIHREY, OF BELLEFONTAINE, OHIO.

CORE-BAR.

Specification of Letters Patent.

Patented Dec. 24, 1907.

Application filed July 11. 1907. Serial No- 383,301.

To all whom it may concern:

Be it known that I, CHARLES S. HUM- PHREY, citizen of the United States, residing at Bellefontaine, in the county of Logan and State of Ohio, have invented certain new and useful Improvements in Core-Bars, of which the following is a specification.

This invention contemplates certain new and useful improvements in collapsible core bars, and the invention has for its object a simple, durable and efficient construction of device of this character for molding and casting pipes, culverts, hollow columns, and the like on a green sand core, the same material being used for the core as on the outside part of the mold, without the necessity of using any combustible material of any kind, such as hay, rope, hemp, or wood.

With these and other objects in view, the invention consists in certain constructions, arrangements and combinations of the parts that I shall hereinafter fully describe and claim.

For a full understanding of the invention and the merits thereof and also to acquire a knowledge of the details of construction and of the'means for eflectingthe result, reference is to be had to the following description and accompanying drawings, in which:

Figure 1 is a side elevation of my improved collapsible core bar, parts being broken away; Fig. 2 is an end view thereof with parts in section; and, Fig. 3 is a detail perspective view of one of the wedge bars.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

My improved collapsible core bar comprises a pair of oomplemental substantially semi-cylindrical frame-like halves or sections, each of which is constructed of any desired number of longitudinally extending angle bars 1, the base members of which are riveted or otherwise secured in slightly spaced relation to each other to supporting segments 2 that are in the form of half rings, with one straight side 3. These segmental supporting sections 2 may be of any desired size and number and may be located at any desired intervals in the length of the main section of the core bar, according as judgnient may dictate, it being understood that the core bar may be of any desired length and diameter.

In the practical operation of using my improved collapsible core bar, the two semicylindrical frame-like sections are placed on end with the straight sides or retaining bars 3 extending parallel and in registry with each other, on the respective halves or sections, and a pair of retaining bolts 4 are passed through each pair of retaining bars 3, so as to prevent the said halves or sections from spreading out beyond a predetermined limit. vI next take two wedge bars 5 and place them in position between the ends of the retaining bars 3. These wedge bars 5 are provided with a plurality of pairs of wedge blocks 6 that are designed to engage the opposing faces of the several pairs of retaining bars 3, so as to force the two halves outwardly until the said retaining bars abut against the heads and nuts of the bolts 4, the said wedge bar being preferably driven upwardly for its wedge action. The sand is then rammed between and around the longitudinally extending angle bars 1, the latter thereby holding the sand in place. After the pipe, culvert, or the like, has been cast and after it becomes somewhat cool, the wedge bars are knocked-down and it is manifest that the core bar is thus rendered loose and free to collapse inwardly to a degree sufficient to accommodate shrinkage of the pipe. The wedge bars 5 are also free to drop towards the center and relieve the strain in that direction.

From the foregoing description in connection with the accompanying drawing, it will be seen that I have rovided a substantial and practical collapsi le core bar for use in molding or casting pipes, and the like on a green sand core, without the necessity of using any combustible materials, and that the wedges may be readily applied between the retaining bars 3 to hold the core bar rigidly in an extended position, while when the casting has been completed, the necessary shrinkage is readily permitted by merely knocking the wedge bars downwardly so as to permit the two halves or sections of the core bar to move inwardly towards each other on the retaining bolts 4.

Having thus described the invention, what is claimed as new is:

1. A collapsible core bar constructed in sections, each of which consists of a series of longitudinally extending bars and segmental rings to which said bars are connected, the

said segmental rings embodying straight sides 3 constituting retaining bars, the said retaining bars of one section extending parallel with the corresponding bars of the other section, and wedges adapted to be inserted between said retaining bars to hold the sections in extended relation, and means for limiting the spreading movement of said sections.

2. A collapsible core bar constructed in sections, each of which consists of segmental rings having straight portions that connect together the ends of their curved portions and a series of longitudinally extending angle bars secured to the curved portions of said rings, one member of the respective longitudinally extending bars projecting out from the rings and the other members that are secured to said rings being spaced from each other, wedges adapted to be inserted between the straight bars of corresponding sections to hold the sections in extended re lation, and means for limiting the spreading movement of said sections.

3. A collapsible core bar constructed in sections, each of which consists of a series of longitudinally extending bars and segmental rings to which said bars are connected, said wings being provided with retaining bars that extend parallel with each other on the respective sections, retaining bolts extending through said bars and limiting the outward movement of one section from the other, and wedge-bars adapted to be inserted endwise between the ends of the retaining bars of the respective sections, each of said wedge-bars being provided with longitudinally disposed wedge blocks adapted to engage the said retaining bars, whereby a longitudinal movement of the wedge bars, after being inserted between the ends of the retaining bars will efliect a wedging action against the retaining bars, as and for the purpose set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

CHARLES s. HUMIHREY. [a s] WVitnesses:

JOHN C. I-Iovnn, BERTI-IA MAR UIs. 

